Symbol Definition Dimension Unit 



M Moment of resultant force about a fixed LF ft-lb 



balance pivot (Fig. 6-16) 



M2 Principal lunar semidiurnal tidal harmonic L ft 



constituent 



m Arbitrary exponent (Section V only) - ~ 



N The dimensionless ratio L^/d^, - - 



N^ Rubble-mound breakwater stability number 



(K cot a)l/3 



n Number of variables in a problem 



•Manning's coefficient of roughness T/L^" sec/ft^'^ 



•Unit vector normal to boundary L ft 



(Eq 2-3 la) 



•Number of layers of armor units or - 



underlayer stones in a rubble-mound 

 breakwater (Eq 6-40) 



n gjj Scale ratio of specified quantity (Section V - - 



only) 



P Porosity of armor units, underlayers, or - - 



core material after placement on breakwater 

 (P < 1) 



•Maximum horizontal wave force on F lb 



parapet as determined by model tests 

 (Figs. 6-34, 6-38, 6-40) 



Pj Armor-unit placing technique - 



p Pressure F/L^ Ib/ft^ 



•Arbitrary exponent (Section V only) ~ ~ 



P(, Pressure in pneumatic chamber relative to F/L^ Ib/it 



atmosphere (Eq 6-32) 



Ap Increment of pressure F/L lb/ft 



•Suction pressure in pneumatic chamber F/L lb/ft 



during subsequent wave motion 

 (Eq 6-30) 



Apj Suction pressure in pneumatic chamber at F/L^ lb/ft 



beginning of wave motion (Eq 6-30) 



Pjji^ Maximum pressure on vertical wall (Eq6-7) 



Ap^ Initial suction pressure in pneumatic 



chamber required to raise water to height 

 h^ (Ap^ > o) (Eq 6-30 through 6-33) 



Pj Theoretical maximum shock pressure on 



vertical wall (Eq 6-8) 



Q Discharge 



Q',Q" Reads "function of" 



525 



F/L^ 



Ib/ft^ 



F/L^ 



Ib/ft^ 



F/O 



Ib/ft^ 



L^/T 



ft^/sec 



